Cool library I may use it for something, thanks for sharing. Look, with SideBar Enhancements you can rigth click the image and select "Open/Run" which will open the image with the default image viewer/editor.Regards

I think is a better idea to add the desktop to "Open-Include" plugin which already try the best to resolve the location of the files.You can check if the included file is an image and load it with desktop.https://github.com/SublimeText/Open-Include